求解一道计算机导论英文题!

题目

求解一道计算机导论英文题!
An imaginary computer has sixteen data registers R0 to R15,512M words in memory,theaddress can address words in the 64M words memory,and have 128 different instructions.A typical instruction of the computer uses the following format:add address,Rx
1.what is the minimum size of an instruction in bits?
2.If the instruction is in the minimum size and the computer uses the same size of word for data and instructions,what is the size of the data bus?
3.what is teh size of the program counter?
4.what is the size of the address bus?
5.what is the minimum size of the control bus?
拜托哥哥姐姐们了!给下思路和答案!

答案

这个今年不考……